僕の存在証明 = Existence of Us

CD single release of the main theme of the 2022 movie series "RE:cycle of the PENGUINDRUM", with an insert song from it as a B-side. Packaged in a resealable polybag, the release comes in a slipcase styled after a book, adorned with gold foil printing and including a spine card with release details, tracklisting and a quote from the artist. Within the slipcase is a jewel case containing the disc, a booklet, and one of 4 randomly assorted "Proof Cards" (証明カード). Early purchase bonuses for this release are button badges, with the color scheme varying by retailer: black (Amazon.co.jp), blue (Tower Records) and white (other participating stores).